Continental Masonry is quite different from that of Scotland, which in turn diverges from that of England. You might be interested to look up a book written by HRH Prince Michael, Duke of Albany, and therefore the continuation of the Continental Stewart/Stuart line, and also information about the Heredom of Kilwinning.
For the record: Masons do NOT kill ANYBODY! As to the secrecy of their rituals, anyone can read about them in any decent library. There may be some areas of obscurity, true, but as a 'society with secrets,' that is about all. One source which touches upon them is Ronald Hutton (cf. his _The Triumph of the Moon_).
The symbol of the Square and Compass enclosing a G is that of the Blue Lodge, and is usually associated with third degree Masonry. Above that, the 14th and 18th degrees, if I recall correctly, are significant, and I believe the latter is connected with a Christian ritual known as Rose Croix Masonry. Above that, one may enter Royal Arch, York Rite, and/or Scottish Rite Masonry; these take one to the 32nd degree. While Masonry is open to all those who adhere to belief in a Supreme being - Roman Catholics, contrary to popular belief, may be and are Masons - some of the paths have specifically Christian imagery, and so, Jews and Muslims may choose not to follow those.
The 33rd degree is awarded as an honor. It is also connected with the Royal Order of Scotland (see also Heredom of Kilwinning), of which the current Lord Elgin(Earl of Elgin and Kincardine), who descends from King Robert the Bruce, is a member.
One might also investigate the Order of Constantine and Aethelstan Lodge.
I do not know which, if any, of these were brought by Scots to Russia, but it would be an interesting endeavor to research it. Continental Masonry may have had links to the Illuminati, the Hellfire Clubs, and the Rosicrucians, inter alia; and it would be most interesting to know what blend was to be found in the Russian lodges. Serge Saltykov, the probable father of Pavel I, was a Freemason; and so, quite possibly, was Sir Charles Hanbury-Williams, who was definitely associated with the Hellfire Clubs of 18th C. London.